Trough and splash guard for rotary polishing or abrading devices



Aug 161192 1,639,419 I 5. H. WILSON THOUGH AND SPLASH GUARD FOR RdTARYPOLISH 1N0 OR ABRADING DEVICES Fiiad Dec. 21, 1925 Patented Aug. 16,1927.

UNITED STATES 1,639,419 PATENT. OFFICE.

SAMUEL HOGGr WILSON, F GLASGOW, .ESCOTLAND.

TBOUGI-I'AND SPLASH GU ARD FOB ROTARY POLISHING- OR ABRADING DEVICES.

Application-filed December 21, 1926, Serial No. 156,184, and inGrea'tIBritain September 26, 1925.

This invention relates to troughs used in connection with rotary'abrading 01' polishing devices; and the invention though havingreference to such troughs in general relates particularly toflthetroughs used in connection with machines for grinding, polishing, andsimilarly treating dentures. Withvide a trough having apivotal splashguard capable of adjustment in two directions so person of the operator,

.3; the sides of as to suit variations in the diameter, shape, or thelocation within the trough of the abrading or polishing. member.

Preferably the splash guard consists of a .narrow tapering canopymounted upon a fixed spindle spanning the sides of the trough, so thatwhilst the sprayed substance is prevented from being deposited on the.the latter nevertheless is permitted freeaccess to the work and a clearview thereof. The guard can be moved by hand towards or away from theabrading or polishing member and when so moved can be automaticallyretained in its adjusted position.

1V ith the splash guard referred to above, a second splash guard may becombined, this guard consisting of a shield which bridges the trough andprojects from the inner surface thereof at the back.

An embodiment of the invention applicable to machines ,for .grinding,polishing .7 and similarly treating dentures will now .be described byway of example and withfreference tothe annexedadrawing, in which Fig. 1is a side view of the said embodiment, partof the trough being brokenaway for clearness;

Fig. 2 :is a'fr'ont view :of the embodiment;

Fig. 3 is an end view of a modification of part of the embodiment shownin Figs. 1 and 2;

Fig. 4 is a half sectional front view corresponding to Fig. 3.

Figs. 5 and 6 are transverse and longitudinal sections respectively of asecond modification of the part shown in Figs. 3 and 4.

Referring to the drawings A sheet metal trough 1 for a rotary abradingor polishing member A is made of crib shape 2(see F ig. 1), being formedwith a base or pedestal 2 on which to rest and with a rear portion3.

WVhen the abrading member'A is in use, abrading materialsuch as powderedpumice stone mixed with water -is contained in the trough 1 in theusualmanner, andthe curved shape of the rear portion 3 and bottom 4 ofthe trough ensures that the material will always gather at the bottom ofthe trough ready to be lifted and applied by the operator. v On the rearportion 3 of the trough 1,'a

shield 5 is .provided, this shield being composed of a dished piece'ofstrip metal arranged to bridge thesides of the trough and project fromthe inner surface at the back. Above the said: shield, is disposed afixed spindle 6 of square (or other noncircular) sect on whichspans thesides of the trough and on Which is turnably mounted a narrowtaperingcanopy 7, which, when in use, eX- tends forwardly from the backof the trough over the abrading member.

The canopy 7 is capable of horizontal adustment onthe fixed-spindle 6,and in order that the :saidc-anopy may also be adjusted about the saidspindle 6, and, virtually, radially of the abrading member, mechanism isprovided within the drum 8 of the canopy to retain the latter in thedifferent positions ,to which it may be turned. This mechanism mayconsist of the means now to be de scribed ,with reference to Figs. 1 and2 or may comprise the modifications hereinafter described with referenceto Figs. 3 and 4,

and Figs. 5 and 6.

In the means shown in Figs. 1 and 2, two discs 9 are mounted so as to beslidable but non-rotatable-on the fixed spindle 6, within the drum 8,and the said discs are forced apart by a spring 10 so that their outersur-.,

faces press against the inner surfaces of the ends '11 of the drum. Thefriction set up between the said surfaces is suflicient to maintain thecanopy 7 in any radial position in which it may be placed, whilstpermitting such radial adjustment to be made with ease.

The modification of the mechanism shown in Figs. 3 and 4, comprises ahollow spool 12 which is slidable but nonrotatable on the spindle 6 ofsquare .section and has a series of holes 13 formed in the collar 14thereof (Fig. 4). The holes 13 are set uniformly at equal radii aroundthe squared spindle 6 and in the end 11 of the drum 8 a single '16through'the holes 13 and 15 in register.

Preferably the pin 16 is loosely atttached to the canopy 7 or trough 1by a small chain 16. V The modification shown in Figs. 5 and 6 comprisesa stationary toothed segment 17 carried by the fixed spindle 6, and arod 18 pressed into contact with the teeth of the said segment bysprings 19 secured within the drum 8, the rod 18 being carried in radialslots 20 (Fig. 5) formed in the ends 11 of the drum 8, which asaforesaid is rotatable and slidable on the fixed spindle 6. The actionof the springs 19 is such that while they constrain the rod 18 to engagefirmly between the teeth of the stationary se ment 17', they permit thesaid rod to ride over the said teeth on rotative movement of the canopyin either direction.

It will be obvious that a narrow canopy as hereinbefore described doesnot prevent light from reaching the work, though it effectively preventsthe abrading material from being deposited on the person of the operatorno matter what may be the size, shape, or location within the trough ofthe abrading member. F or example, when a new abrading member is fitted,the canopy 7, of course, is raised, but when the said member becomessmaller due to continued use, the canopy can always be set in itscorrect operative position relative to the said member. If desired asmall sponge or brush may be fitted within a pocket 21 on the point ofthe canopy 7 for the purpose of cleaning the abrading member. Inaddition, a small rest 2* may be provided on the trough to support thedenture or other article being ground or polished.

I claim 1. In rotary abrading devices, the combination of a rotatableshaft and any one of a number of interchangeable abrading membersadapted to be supported thereby, with a broad trough, a spindle fixed inand span ning the sides of the trough, a narrow canopy slidable andturnable by hand on the said spindle, and means whereby the canopy whenturned about the spindle is automatically retained in its adjustedposition.

2. In rotary abrading devices,.the combination of a rotatable shaft andany one of a number of interchangeable abrading members adapted to besupported thereby, with broad trough, a spindle fixed in and spanningthe sides of the trough, a narrow canopy slidable and'turnable by handon the said spindle, a pair of discs slidably and non-rotatably mountedon the said spindle, and spring means whereby the said discs are forcedapart from each other so as to press frictionally against a portion ofthe canopy.

3. In rotary abrading devices, the combination of a rotatable shaft andanyone of a number of interchangeable abrading members adapted to besupported thereby, with a broad, trough of which the bottom and back arecurved, a base for the trough, a spindle fixed in and spanning the sidesof the trough, a narrow canopy slidable and turnable by hand on thesaidspindle and arranged in spaced relationship tothe back of the trough, ashield adapted tobridge the sides of the trough and project from theback thereof underneath the said canopy and means whereby the canopywhen turned about the spindle is automatically retained in its adjustedposition. 7

i. In rotary abrading devices, the combination of a rotatable shaft andany one of a number of interchangeable abrading members adapted tobesupported thereby, with a broad trough of which the bottom and backare curved, a base for the trough, aspindle fixed in and spanning thesides of the trough, a narrow canopy slidable and turnable by hand onthe said spindle and arranged in spaced relationship to the back of thetrough, shield adapted to bridge the sides of the trough and project.from the back thereof underneath the said canopy, a pair of discsslidably and non- SAMUEL Hose WrLsoN

